[U-Boot] [PATCH v2 1/4] mxs: Remove not required explicit iomux-mx28.h include

[Marek Vasut]

Dear Otavio Salvador,

> The iomux header is included on sys_proto.h so to avoid SoC specific
> header inclusion.
> 
> Signed-off-by: Otavio Salvador <otavio at ossystems.com.br>

Acked-by: Marek Vasut <marex at denx.de>

Stefano, can you please apply?

Best regards,
Marek Vasut